OS X: When you start running out of space on your Mac, the best way to figure out where it's all gone is to use a disk space analyzer. DaisyDisk, one of our favorite disk analyzers, is on sale for only $5, down from its usual price of $10.

While there are some great free options out there—like our favorite, Disk Inventory X—DaisyDisk can be a bit easier to read, not to mention a bit prettier. In fact, when we polled you for your favorite disk space analyzers, DaisyDisk is the only Mac app that made the top 5. Even if you don't need it right now, it's a good app to have around for the inevitable day you run out of hard drive space, and grabbing it while it's only $5 is a good idea. Hit the link to check it out.